Apache HTTP Server Version 1.3

You are looking at the documentation for the
1.3 version of the Apache HTTP Server, which is no longer
maintained, and has been declared "end of life". If you are in
fact still using the 1.3 version, please consider upgrading.
The current version of the server is 2.4.
In the current version of the server, you should use
mod_log_config.

Module mod_log_common

This module is contained in the mod_log_common.c
file, and is compiled in by default. It provides for logging of
the requests made to the server using the Common Logfile
Format. This module has been replaced by mod_log_config in
Apache 1.2

Log file format

The log file contains a separate line for each request. A line
is composed of several tokens separated by spaces:

host ident authuser date request status bytes

If a token does not have a value then it is represented by a
hyphen (-). The meanings and values of these tokens are as
follows:

host

The fully-qualified domain name of the client, or its IP
number if the name is not available.

ident

If IdentityCheck is
enabled and the client machine runs identd, then this is the
identity information reported by the client.

authuser

If the request was for a password protected document,
then this is the userid used in the request.

A program to receive the agent log information on its
standard input. Note the a new program will not be started
for a VirtualHost if it inherits the TransferLog from the
main server. See, just as an example, cronolog.

Security: if a program is used, then it will
be run under the user who started httpd. This will be root if
the server was started by root; be sure that the program is
secure.

Security: See the security tips document
for details on why your security could be compromised if the
directory where logfiles are stored is writable by anyone other
than the user that starts the server.